Pretty much anything can cause cancer, Milk is such a low risk thing that to avoid drinking it because of whatever puny risk involved would be remedial, yet smoking 50 ciggys a day will be stupidly high risk. If any of these people where serious about this they would be living in a bubble roaming fields in the country side eating steralized food grown inside their own bubble and even then their would be a chance of them getting cancer. But then again we do have to remember that we're dealing with vegans here, and not just any vegan but extremly anal vegans in PETA. Logic does not compute in their brains.